[olejorgenb]

> http://imgur.com/a/yx2H9

That's neat. I know little about music. Would it be close to correct to say that this program finds the notes (hz, fourier) and checks if they the progression fit some predetermined pattern. eg. B4 must be followed by one of X1,X2,..., osv. ?

> EDIT: nevermind, ...

Does this mean there's songs which the program fails to classify?

It would be interesting to see the output of the program for all the songs.

[robhack]

It does indeed fourier analysis to find the notes. But I'm sorry to disappoint you, it does no progression analysis, so it's useless for this particular exercise (it's only handy to see the notes when you don't have an absolute pitch earing).